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  <p>
    Reports incorrect path reference expressions.
  </p>
  <p>
    A path reference expression is considered as incorrect
    if it doesn't match specific file extensions,
    which are declared by the <code>file_extensions</code> option on the matched CWT expression.
  </p>
  <!-- tooltip end -->
  <p>
    A path reference expression is a script expression matching CWT expression data type
    <code>"filename"</code>, <code>"filepath"</code> or <code>"icon"</code>,
    which represents a file path.
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